Ning Bo, abbreviation another name for Ningbo, sheet of deputy provincial town, plan lists city, the 4th big haven of world city, have formulate local laws and regulations the bigger city of attributive, chinese mainland is integrated before competition ability 15 strong cities, long triangle city group one of centers of 5 large area, grow center of economy of the ala austral trigonometry, zhejiang visits economic center, continue to hold a title 4 times continuously countrywide civilized town, the countryside of the academician of Chinese high quality, 2016 of East Asia culture.
Fireproof clay product has a variety of forms, its pledge the quantity asks basically is alumina prep above 38% (it is 42-47% normally) and content of low iron low alkali metal. These products but not to calcine or classics to calcine, include product of high-powered to calcine to be like Molaishi.
Fireproof clay (Refractory Clays) use at boarding (Shaped) with indeterminate form (integral figuration -- Monolithic) is fireproof the production of material. Brick (Brick) the product includes fireproof clay brick (Fire Clay Bricks) , if blast furnace cuts off brick (Checker Bricks) with tall alumina brick (High Alumina Bricks) , if be used at the brick propping up of horizontal electric induction furnace and liner of perpendicular electric induction furnace. In amorphous makings branch, have a variety of product spending, if fireproof clay, excess load uses plasticity makings, tall alumina,plastic, fireproof clay is mixed tall alumina is pouring makings.
Fireproof clay basically is comprised by aluminium of hydration silicon acid, its structural formula is 2H2O of · of Al2O3 · 2SiO2 (namely silicon of 39.5% alumina, 46.5% 2 oxidation and 14% water) . In this group mineral in, kaolin puts an elephant to be rich.
Fireproof clay, firestone clay (Flint Clay, or call horniness clay Hard Clay) , ball clay (Ball Clay, or call plasticity clay Plastic Clay) with kaolin (Kaolins) . Nevertheless, its common characteristic is, these mineral products contain kaolinite, and its composition is 20-45%Al2O3, < 3%Fe2O3 and < 3%Na2+K2O.
Lift in temperature when kaolinite the condition issues to calcine gradually when, its are mineral produce change ceaselessly, generate when about 550 ℃ inferior kaolin (Metakaolin, al2Si2O7) , pointed spar is generated when about 1000 ℃ (Spinel, (Al2O3) 2(SiO2) 3+SiO2) , generate when about 1100 ℃ be like Molaishi (Pseudo-mullite, [Al2O3 · SiO2]2) . Another kind " fireproof clay " the product is Molaishi (3Al2O3 · 2SiO2) , it can issue kaolin of to calcine tall alumina and alumina to pledge at 1200-1500 ℃ condition (Bauxitic) kaolin is made. Below these temperature, the main and mineral photograph of clay (Main Mineral Phases) translate into Mo Laishi, Fang Yingshi (Cristobalite) with photograph of a kind of glass (Glassy Phase) .
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